Parkinson's disease (PD) is associated with a progressive decline in mobility, which predicts decreased health-related quality of life (HRQoL). An early sign of impaired mobility is decreased walking activity. Many previous studies show that supervised exercise interventions are associated with increased HRQoL and functional mobility. However, the effect of regular exercise outside of supervised interventions remains unclear. Therefore, the aim of this study was to examine the association between exercise habits, HRQoL and functional mobility.